Tube strucure

All-glass concentric co-axiall structure

Tube material

High quality borosilicate glass 3.3

Outer tube diameter and thickness

Φ=47±0.7mm & =1.6mm
Φ=58±0.7mm & =1.6mm
Φ=70±0.7mm & =2.0mm

Internal tube diameter and thickness

Φ=37±0.7mm & =1.6mm
Φ=47±0.7mm & =1.6mm
Φ=58±0.7mm & =1.6mm

Tube length

1200mm 1500mm 1800mm 1900mm 2000mm 2100mm

Absorptive
coating
property

Strucure

Cu/Ss- AL-ALN

Sediment Mothod

Three target magnetron vacuum sputtering plating

Absorptance

as=0.93-0.96(AM1.5)

Emissivity

Σ h=.0.04-0.06(80oc±5⁰c)

Vacuum tightness

P ≤ 5.0 × 10^-3 Pa

Stagnation parameter

Y=260-300M². ⁰C/kw

Solar irradiation for
obtaining a preset water  temperature

H≤4.7MJ/m²

(Φ58 mm tube) H=3.7-4.2MJ/m²

H≤3.7MJ/m²

(Φ47 mm tube) H=2.9-3.2MJ/m²

Average heat loss coefficient

ULT=0.4-0.6W(M². ⁰C)

Lifetime

15years

Hail resistance

Φ25mm